Copper occurs naturally as Cu-63 and Cu-65. Given Atomic Weight of Carbon is 63.546, Which isotope is more abundant?

Options

(a) Cu-65
(b) Both Cu-63 and Cu-65
(c) Cu-63
(d) None

Correct Answer:

Cu-63

Explanation:

Average Atomic weight is closer to 63 than to 65, so we can concude that Cu-63 is the more abundant isotope.